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Linux/fs/sysv/namei.c

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  1 // SPDX-License-Identifier: GPL-2.0
  2 /*
  3  *  linux/fs/sysv/namei.c
  4  *
  5  *  minix/namei.c
  6  *  Copyright (C) 1991, 1992  Linus Torvalds
  7  *
  8  *  coh/namei.c
  9  *  Copyright (C) 1993  Pascal Haible, Bruno Haible
 10  *
 11  *  sysv/namei.c
 12  *  Copyright (C) 1993  Bruno Haible
 13  *  Copyright (C) 1997, 1998  Krzysztof G. Baranowski
 14  */
 15 
 16 #include <linux/pagemap.h>
 17 #include "sysv.h"
 18 
 19 static int add_nondir(struct dentry *dentry, struct inode *inode)
 20 {
 21         int err = sysv_add_link(dentry, inode);
 22         if (!err) {
 23                 d_instantiate(dentry, inode);
 24                 return 0;
 25         }
 26         inode_dec_link_count(inode);
 27         iput(inode);
 28         return err;
 29 }
 30 
 31 static struct dentry *sysv_lookup(struct inode * dir, struct dentry * dentry, unsigned int flags)
 32 {
 33         struct inode * inode = NULL;
 34         ino_t ino;
 35 
 36         if (dentry->d_name.len > SYSV_NAMELEN)
 37                 return ERR_PTR(-ENAMETOOLONG);
 38         ino = sysv_inode_by_name(dentry);
 39         if (ino)
 40                 inode = sysv_iget(dir->i_sb, ino);
 41         return d_splice_alias(inode, dentry);
 42 }
 43 
 44 static int sysv_mknod(struct inode * dir, struct dentry * dentry, umode_t mode, dev_t rdev)
 45 {
 46         struct inode * inode;
 47         int err;
 48 
 49         if (!old_valid_dev(rdev))
 50                 return -EINVAL;
 51 
 52         inode = sysv_new_inode(dir, mode);
 53         err = PTR_ERR(inode);
 54 
 55         if (!IS_ERR(inode)) {
 56                 sysv_set_inode(inode, rdev);
 57                 mark_inode_dirty(inode);
 58                 err = add_nondir(dentry, inode);
 59         }
 60         return err;
 61 }
 62 
 63 static int sysv_create(struct inode * dir, struct dentry * dentry, umode_t mode, bool excl)
 64 {
 65         return sysv_mknod(dir, dentry, mode, 0);
 66 }
 67 
 68 static int sysv_symlink(struct inode * dir, struct dentry * dentry, 
 69         const char * symname)
 70 {
 71         int err = -ENAMETOOLONG;
 72         int l = strlen(symname)+1;
 73         struct inode * inode;
 74 
 75         if (l > dir->i_sb->s_blocksize)
 76                 goto out;
 77 
 78         inode = sysv_new_inode(dir, S_IFLNK|0777);
 79         err = PTR_ERR(inode);
 80         if (IS_ERR(inode))
 81                 goto out;
 82         
 83         sysv_set_inode(inode, 0);
 84         err = page_symlink(inode, symname, l);
 85         if (err)
 86                 goto out_fail;
 87 
 88         mark_inode_dirty(inode);
 89         err = add_nondir(dentry, inode);
 90 out:
 91         return err;
 92 
 93 out_fail:
 94         inode_dec_link_count(inode);
 95         iput(inode);
 96         goto out;
 97 }
 98 
 99 static int sysv_link(struct dentry * old_dentry, struct inode * dir, 
100         struct dentry * dentry)
101 {
102         struct inode *inode = d_inode(old_dentry);
103 
104         inode->i_ctime = current_time(inode);
105         inode_inc_link_count(inode);
106         ihold(inode);
107 
108         return add_nondir(dentry, inode);
109 }
110 
111 static int sysv_mkdir(struct inode * dir, struct dentry *dentry, umode_t mode)
112 {
113         struct inode * inode;
114         int err;
115 
116         inode_inc_link_count(dir);
117 
118         inode = sysv_new_inode(dir, S_IFDIR|mode);
119         err = PTR_ERR(inode);
120         if (IS_ERR(inode))
121                 goto out_dir;
122 
123         sysv_set_inode(inode, 0);
124 
125         inode_inc_link_count(inode);
126 
127         err = sysv_make_empty(inode, dir);
128         if (err)
129                 goto out_fail;
130 
131         err = sysv_add_link(dentry, inode);
132         if (err)
133                 goto out_fail;
134 
135         d_instantiate(dentry, inode);
136 out:
137         return err;
138 
139 out_fail:
140         inode_dec_link_count(inode);
141         inode_dec_link_count(inode);
142         iput(inode);
143 out_dir:
144         inode_dec_link_count(dir);
145         goto out;
146 }
147 
148 static int sysv_unlink(struct inode * dir, struct dentry * dentry)
149 {
150         struct inode * inode = d_inode(dentry);
151         struct page * page;
152         struct sysv_dir_entry * de;
153         int err = -ENOENT;
154 
155         de = sysv_find_entry(dentry, &page);
156         if (!de)
157                 goto out;
158 
159         err = sysv_delete_entry (de, page);
160         if (err)
161                 goto out;
162 
163         inode->i_ctime = dir->i_ctime;
164         inode_dec_link_count(inode);
165 out:
166         return err;
167 }
168 
169 static int sysv_rmdir(struct inode * dir, struct dentry * dentry)
170 {
171         struct inode *inode = d_inode(dentry);
172         int err = -ENOTEMPTY;
173 
174         if (sysv_empty_dir(inode)) {
175                 err = sysv_unlink(dir, dentry);
176                 if (!err) {
177                         inode->i_size = 0;
178                         inode_dec_link_count(inode);
179                         inode_dec_link_count(dir);
180                 }
181         }
182         return err;
183 }
184 
185 /*
186  * Anybody can rename anything with this: the permission checks are left to the
187  * higher-level routines.
188  */
189 static int sysv_rename(struct inode * old_dir, struct dentry * old_dentry,
190                        struct inode * new_dir, struct dentry * new_dentry,
191                        unsigned int flags)
192 {
193         struct inode * old_inode = d_inode(old_dentry);
194         struct inode * new_inode = d_inode(new_dentry);
195         struct page * dir_page = NULL;
196         struct sysv_dir_entry * dir_de = NULL;
197         struct page * old_page;
198         struct sysv_dir_entry * old_de;
199         int err = -ENOENT;
200 
201         if (flags & ~RENAME_NOREPLACE)
202                 return -EINVAL;
203 
204         old_de = sysv_find_entry(old_dentry, &old_page);
205         if (!old_de)
206                 goto out;
207 
208         if (S_ISDIR(old_inode->i_mode)) {
209                 err = -EIO;
210                 dir_de = sysv_dotdot(old_inode, &dir_page);
211                 if (!dir_de)
212                         goto out_old;
213         }
214 
215         if (new_inode) {
216                 struct page * new_page;
217                 struct sysv_dir_entry * new_de;
218 
219                 err = -ENOTEMPTY;
220                 if (dir_de && !sysv_empty_dir(new_inode))
221                         goto out_dir;
222 
223                 err = -ENOENT;
224                 new_de = sysv_find_entry(new_dentry, &new_page);
225                 if (!new_de)
226                         goto out_dir;
227                 sysv_set_link(new_de, new_page, old_inode);
228                 new_inode->i_ctime = current_time(new_inode);
229                 if (dir_de)
230                         drop_nlink(new_inode);
231                 inode_dec_link_count(new_inode);
232         } else {
233                 err = sysv_add_link(new_dentry, old_inode);
234                 if (err)
235                         goto out_dir;
236                 if (dir_de)
237                         inode_inc_link_count(new_dir);
238         }
239 
240         sysv_delete_entry(old_de, old_page);
241         mark_inode_dirty(old_inode);
242 
243         if (dir_de) {
244                 sysv_set_link(dir_de, dir_page, new_dir);
245                 inode_dec_link_count(old_dir);
246         }
247         return 0;
248 
249 out_dir:
250         if (dir_de) {
251                 kunmap(dir_page);
252                 put_page(dir_page);
253         }
254 out_old:
255         kunmap(old_page);
256         put_page(old_page);
257 out:
258         return err;
259 }
260 
261 /*
262  * directories can handle most operations...
263  */
264 const struct inode_operations sysv_dir_inode_operations = {
265         .create         = sysv_create,
266         .lookup         = sysv_lookup,
267         .link           = sysv_link,
268         .unlink         = sysv_unlink,
269         .symlink        = sysv_symlink,
270         .mkdir          = sysv_mkdir,
271         .rmdir          = sysv_rmdir,
272         .mknod          = sysv_mknod,
273         .rename         = sysv_rename,
274         .getattr        = sysv_getattr,
275 };
276 

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